Pool boiling heat transfer characteristics of R-1233zd(E) on smooth tube subject to POEC-220 lubricant oil

•Pool boiling HTC of R-1233zd(E) alternative to R-123 and R-245fa is investigated.•Tests are conducted on the smooth tube with the effect of POE lubricant oil.•Heat transfer coefficients of R-1233zd(E) are lower than that of R-123 and R-245fa.•With the effect of POE-oil (ω: 0–10%) HTCs degraded by up to 43%.•The nucleation sites are significantly affected by the oil addition.